Just got a Flowmaster 40 series on my F150. It is not very loud. I was wondering if it would get louder if I took two of the Cats off. Also would it hurt the truck to take the two cats off.

 

I don't see where taking only the back 2 off would hurt anything. It would make it a little louder. My friend however has a 4.6 and was running consistent 16's flat until he took all 4 cats off and it dropped him 4/10's to a 16.40 the next week at the track. Needless to say, he put them back on. Just my opinion.

 

i personally dont like cats either... they scratch.

 

If you take the cats off don't smoke near the exhaust... j/k

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